A courier service guy has to deliver a parcel to a particular flat in an apartment. There are five floors in the apartment and a ground floor. There are twelve flats on each floor and ground floor is for parking. The flats are numbered according to the floor, the flats on the first floor are numbered 101,102 ….112, similarly on the second floor, flats are numbered as 201,202…….212, and this is repeated on each floor. The courier guy forgot the number of the flat but remembers that it was not on second or third floor and digit “1” was there exactly once in the flat number. What is the probability that he delivered the courier in the correct flat?

A. \(\frac {1} {16}\) B. \(\frac {1 } {24}\) C. \(\frac {1 } {1 4}\) D.\(\frac {1 } {22 }\) E. None of these

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